Monday, November 9, 2009

I've been in Goma for the last week and a half, working with the HEAL Africa Technical Department to implement two projects. I knew starting and finishing two projects in so short a time was an ambitious goal, but I've been learning these last few days just how ambitious it actually was.

Firstly, I have been frantically finishing work on a solar refrigerator. There was more work to be done than I anticipated (seems to be a common theme!). I also worked hard toward a solution that in the end did not work out. Essentially, to provide thermal mass to the fridge I wanted to seal a large amount of water inside. Turns out making something water tight is easier said than done. In the end I had to give up using water and instead turn to using concrete. The thermal mass is about half that of water, but still should keep the fridge cold for several hours during a power outage.

Pouring the concrete was a nerve-racking experience. Once poured, my decisions permanent. If it didn't work, I couldn't do much to fix it. Success or failure! After drying, I plugged the fridge in and waited. 3 hours, no change. 5 hours, 1 degree C, but that was likely because the day had gotten cooler. It was looking like failure. And in one way it most certainly was, because I had run out of time - I had been planning on taking the fridge to a rural hospital the next day. I couldn't take it without knowing if it worked or not.

And so I traveled north to Rwanguba empty-handed. However, while there I did get some great work done. A few years ago the hospital had a small solar lighting system installed by the International Rescue Committee. Last time I visited in July it was not functioning, and probably hadn't been in a while. This visit I was determined to offer something, even if not what I had originally hoped for. And so, after a few hours work with the staff engineer, we got the lights back on. With lighting now for two wards, they will be able to run their generator much less, saving money.

Back in Goma, work is progressing on the second project, a water filter for a rainwater collection system. Gutters have been installed, and more items will be purchased and installed in the next few days. With any luck, it will be near completion by the time I leave next Sunday.

And so now I have to take stock of the next steps. The fridge is still being tested - it's now dropped 6 degrees C in 2.5 days, so I think maybe, just maybe, it's working. Apparently it takes a long time to cool concrete! The benefit though is that with high thermal mass, it will also take a long time to warm up, providing cooling even during power outages. Looks like my calculations were incorrect!

So much of this work is new for me, I have been learning a lot. The principle lesson is that success is quite unlikely the first time you try something. I'm trying to not be discouraged by failure, but to learn what went wrong and try again. I think we've all heard this before, but it's quite different to be told that than to actually have to go through it.

1 comment:

Oh my goodness, this mzungu actually has a comment that may be of actual value! Are we installing some insulation on the exterior of the concrete? Depending on the design temp of the fridge and where it is being place (in the ground, I wonder?), it may make sense if it is an option. God be with you!

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Clean water is a mundane but vital part of everyday life. And yet 2.7 billion people don't have access to something so simple as fresh water. Why is this so? What can be done about it? Time to learn and find out.